Editing Motor types
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Position, velocity and torque/force control applications mainly rely on two main categories of motors: '''servo motors''' and '''stepping motors'''. | Position, velocity and torque/force control applications mainly rely on two main categories of motors: '''servo motors''' and '''stepping motors'''. | ||
− | + | '''Servo motor''' is a electromechanical mechanical actuator with feedback allowing precision [[Closed loop|closed loop]] motion control and monitoring. | |
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− | + | '''Stepping motor''' is a low cost alternative to servo motors and can be operated without [[feedback devices]]. | |
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==Construction== | ==Construction== | ||
Servo motor consists two main parts: | Servo motor consists two main parts: | ||
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Brush DC (direct current) motors typically have permanent magnet stator and rotor with mechanical commutator with brushes. | Brush DC (direct current) motors typically have permanent magnet stator and rotor with mechanical commutator with brushes. | ||
===Stepping motor=== | ===Stepping motor=== | ||
− | + | Stepper motors are high pole count permanent magnet brushless motors with 2 or 3 phase windings. High pole count enables position control without feedback devices but with several drawbacks such as risk of lost position. | |
==Comparison== | ==Comparison== | ||
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| [[Closed loop]] || No || Yes || Yes || Yes | | [[Closed loop]] || No || Yes || Yes || Yes | ||
|- | |- | ||
− | + | | Torque control || No, inpractical || Yes || Yes || Yes | |
|- | |- | ||
− | + | | Velocity control || Yes || Yes || Yes || Yes | |
|- | |- | ||
− | + | | Position control || Yes || Yes || Yes || Yes | |
|- | |- | ||
| Available speed range || Low, Medium || Medium || High || Highest | | Available speed range || Low, Medium || Medium || High || Highest | ||
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| Dynamic performance || Low, medium || Medium||High||High | | Dynamic performance || Low, medium || Medium||High||High | ||
|- | |- | ||
− | | Motion smoothness || Low to | + | | Motion smoothness || Low to high||Medium||Medium||High |
|- | |- | ||
| Endurance || High || Medium || High || High | | Endurance || High || Medium || High || High | ||
|- | |- | ||
| Energy efficiency || Low, medium || Medium || High || High | | Energy efficiency || Low, medium || Medium || High || High | ||
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|} | |} | ||
==See also== | ==See also== | ||
*[[Feedback devices]] | *[[Feedback devices]] | ||
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